public class Book implements Comparable {
   double price;
   String name;
   public void setPrice(double c) {
     price=c;
   }
   public double getPrice() {
      return price;
   } 
   public void setName(String n) {
      name=n;
   }
   public String getName() {
     return name;
   } 
   public int compareTo(Object object) {
      Book bk=(Book)object;
      int difference=(int)((this.getPrice()-bk.getPrice())*10000);
      return  difference;
   }
}

